Steam-generator



(No Model.) 2 Sheets-Sheet 1. E. E. ROBERTS. STEAM GENERATOR.

I a Q No. 415,397. Patgnted Nov. 19, 1889.

ATTO R N EY N. PUERS, Fholnhkhogmphnr. Washington, D, c.

(No Model.) 2 Sheets-Sheet 2.

.E. E. ROBERTS. STEAM GENERATOR.

No. 415,397. 5 Patented Nov. '19, 1889.

WITNESSES? 5 UNITED STATES PATENT OFFICE.

EIHVARD E. ROBERTS, OF RED BANK, NElV JERSEY.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 415,397, dated November19, 1889.

Application filed May 31, 1889. Serial No. 312,720. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD E. ROBERTS,

a citizen of the United States, residing at Red Bank, county ofMonmouth, State of New Jersey, have invented certain new and usefulImprovements in Steam-Generators, of which the following is aspecification.

My present improvement relates to generators of the class described byme in Letters Patent No. 371,710, dated October 18, 1887; and itcomprises certain modifications of the arrangement and manner ofconnecting the various pipes therein with relation to the steam andwater drum, without, however, departing essentially from the originalprinciple of operation.

It is an important object to promote rapidity of circulation, andthereby equalize the temperature of different parts of the boiler.Thisis accomplished herein by shortening the circuit of thegenerating-coils, reducing the size of the units of the structure, andmultiplying their number. By the latter expedient an increasedheating-surface is obtained as well as the easier replacement of suchreduced parts should repairs become necessary.

My invention consists in certain novel features of construction of thedistributingpipes, wherein they are located transversely as well aslongitudinally to the boiler, being arranged about the lower margins ofthe structure.

My invention also consists in the use of longitudinal coils connectingindependently between the transverse distributers aforesaid and thedrum.

Referring to the accompanying drawings, forming a part of thisspecification, and in which similar letters of reference indicatecorresponding parts, Figure 1 is a transverse section on the line :0 00Fig. 2, showing the feature of shortening the course of circulation byreducing the unit-coils of the structure; Fig. 2, a longitudinal sectionon the line :0 Fig. 1; and Fig. 3, an inverted plan view of the drum,showing details of pipeconnection. Fig. 4 illustrates a modification ofFig. Fig. 5 is afront elevation with the outside casing in section,showing the adaptation of the structure for multiple drums;

Fig. (5, a modification of Fig. 5, and Fig. 7 an inverted plan view ofthe center drum of Fig. 5.

Referring to Figs. 1 to 4, inclusive, in lieu of employing transversecoils extending the entire width of the boiler, springing alternatelyfrom opposite distributers, as illustrated in Fig. 3 of the aforesaidpatent, I here employ ranges of short transverse coils E, extending halfor less than half the width of the boiler, the units of each rangespringing successively from the same distributor. I also employcross-pipes C or distributers, and likewise connect longitudinal rangesof generating-coils E to such cross-pipes 0*, connecting saidlongitudinal coil's -with the drum at suitable intervals. In this case Iprefer to extend each transverse distributer C but half the width of thestructure, as seen in Figs. 1., 5, and 6, permitting the currents fromthe downfiow-pipes C (in this instance four in number) to circulateindependently on opposite sides of the generator.

The fire-doors are employed in duplicate, so as to clear the upflowpipes c of the coils E.

The connections of the generating-coils with the drum are so arranged asto avoid too close proximity of the holes drilled in the shell, in ordernot to weaken the same. This arrangement of connection will beunderstood by an inspection of Fig. 3, the connecting branches 6 e ofthe transverse coils connecting with the respective holes similarlydesignated, and the longitudinal coils being connected in any desirednumber in two lines 0 P, the holes in each case being staggered.

The mode of connection of the longitudinal coils will be betterunderstood by observation of Fig. 7.

The coils E E and E E combine to form the crown of the furnace, and theunits of the coils being thus subdivided and placed effect on thesteaming capacity of the boiler. I

Again, the removal of a section of coil can be the more easilyaccomplished, due to the decreased size herein employed.

The longitudinal coils may be omitted altogether, the transverse coilsextending the full half-width of the furnace, as illustrated in Fig. 4.The shortening of the coils thereby effected promotes rapidity ofcirculation and is a desirable feature, especially in boilers of largesize, wherein the half-length of coil will afford ample opportunity fora suflicient absorption of heat during the upward passage of thecurrent.

Referring now to Figs. 5, 6, and 7, in generators of large size it isfound advantageous in many instances to employ a plurality of steam andwater drums. The construction of lengthwise and cross series of shortcoils is especially applicable to multiple drums. The series of drums DD D are connected by means of the cross-pipes 0, located at front andrear of the structure. The downflow-pipes C, located at the four cornersof the structure, connect the crosspipes O with the junction of thelongitudinal distributers (J and the transverse distributers C Thecentral drum D receives the upward circulation of the longitudinalgenerating-coils E from the front and rear transverse distributers C thecirculation being drawn equally from opposite sides of the boiler. Theside drumsl) D receive the up- Ward circulation of the transversegenerating-coils E from the longitudinal distributers O at therespective sides of the boiler. The

manner of connecting the branches c e of the coils to the drums remainssubstantially the same in the instances of both Figs. 5 and 6, as in theinstance of Figs. 1, 2, and 3. In Fig. (3 the respective lateraldivisions of the lon-' gitudinal ranges of coils are connected each toone corresponding side of a drum D or D in a similar manner to that'bywhich they are both connected to a common drum D,in Figs. 5 and 7.Otherwise the general characteristics of Fig. 5 also apply to Fig. 6.

In practice the generating-coils employed in connection with theplurality of drums may be built up to a much greater extent verticallyin proportion to the grate-surface than indicated in Fig. 5. are locatedbetween the drums as well as exterior to them, as illustrated, and thesuperheating coils or otheraccessories to the boiler may be similarlyapplied, as in the instances hereinbefore referred to.

I claim as my invention 1.. The combinatio mwith the steam and waterdrum, the doWnfiow-pipes, and the longitudinal and transversedistributers, of generating-coils springing from the distributerscomposed of both transverse and longitudinal return-bends forming thecrown of the fire-box and communicating at their upper ends with thedrum.

2. The combination of a steam and Water drum or drums, cross-pipesconnecting the drum or drums with downflow-pipes, longitudinal andtransverse distributing-pipes, longitudinal generating-coils springingfrom the transverse distributers at front and rear of the boiler,meeting end to end at or near the center of the fire-box, transversegenerating-coils springing from the longitudinal distributers at eachside of the boiler, extending to the body of longitudinal coils, all ofsaid coils forming the crown of the fire-box and communicating at theirupper ends with the said drum or drums.

EDWARD E. ROBERTS.

\V i tnesses H. F. PARKER, C. W. FORBES.

The feed-coils G

